Position the caret at the name of a static method that meets the above requirements, or select
it in File Structure.

Choose ReSharper | Refactor | Convert | Static to Extension Method.

The refactoring will be carried out without requiring you to specify any further options.

Consider the following method declaration: and its usage: After
converting it to an extension method, its signature will receive an additional this
parameter: and it will be called
like a common instance method: